Investments - Available-For-Sale Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 5,926
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	4,198	$ 2,389
Gross Unrealized Gains	1	3
Gross Unrealized Losses	0	0
Estimated Fair Value	4,199	2,392
Short-term Investments \| Restricted cash
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	22	137
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	22	137
Short-term Investments \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	4,151	2,252
Gross Unrealized Gains	1	3
Gross Unrealized Losses	0	0
Estimated Fair Value	4,152	2,255
Short-term Investments \| Government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	25
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	25
Long-term Investments
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	1,733	284
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(7)	0
Estimated Fair Value	1,727	286
Long-term Investments \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	954	284
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(5)	0
Estimated Fair Value	950	$ 286
Long-term Investments \| Government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	779
Gross Unrealized Gains	0
Gross Unrealized Losses	(2)
Estimated Fair Value	$ 777

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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